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发明名称
Improvements relating to yielding supports for mine arches
摘要
申请公布号
GB1007592(A)
申请公布日期
1965.10.13
申请号
GB19650015485
申请日期
1960.12.28
申请人
THE UNITED STEEL COMPANIES LIMITED
发明人
BABB ALAN SPENCER;HAYNES JOHN MICHAEL
分类号
E21D11/18
主分类号
E21D11/18
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代理人
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